The phrase "picture postcard" refers to a beautiful or scenic photograph that is used as a decoration or sent to someone as a greeting. It often captures a picturesque view or location. Full definition
Summer is about possibilities — romance, peace, picture postcard views... and renewal. (petergreenberg.com)
The island's beaches are a big draw, picture postcard perfect with powder white sand and turquoise sea. (vietnam-guide.com)
The earliest known picture postcard was An organization or economic system where goods and services are exchanged for one another or for money. (myintimcity.com)